Elevator-brake.



P. H. THURBER. ELEVATOR BRAKE. APPLIOATION FILED APEJS, 1911.

Patented Mar. 3, 1914.

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BY ,Q/Q/ yr f ATTORNEY P. H. THURBER.

ELEVATOR BRAKE.

APPLIOATION rum) APXLB, 1911.

1,088,744 Patented Mar. 3, 1914.

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:1 w J 1972, a? /7 x o J WITNESSES: INVENTOR J-nw i I BY nism to rest quickly and smoothlywithout tions to illustrate its operation.

of the machine to which my bruise in applied.

UNITED STATES PATENT onnron.

H. THURBER, OF NEWARK. NEW JERSEY, ASSIGNOR, BY MESNE ASSIGN- MEETS, TO GU'BNEY ELECTRIC ELEVATOR COMPANY. OF HDNESDALE, IIGNNSYL- VANIA, A CORPORATION OF YENNSYLVANIA.

ELEVATORPBEAKE.

Specification of Letters Patent.

lnton'tedl Mar. 3, 1914.

Application ruse April 6, 191A. Serial No. 613.2239;

To all whom '1' I. may enown.

Be it known that I', Fuennmou H. Tune non, a. citizen; ofi-the United States. and a resident of Newark, in the county of Essex and State of'Ne-w Jersey, United States ot America, have invented certain new and useful Improvements in Elevator-Brakes, of which the following is a. specification.

My invention relates to elevator brakes, and its object is to improve upon devices of this type and to provide a simple arrangement of ports for bringing a. driven mocha-- subjecting it to sudden strain.

I, will describe my invention in. the follow ing specification and point: out the novel features thereofi in. the appended claims.

Referring" to the drawingm. Figure 1 is its side elevation, portly in section, of a: brake mechanism made meownoting to my invention. In Figs. 2', 3s and 4 I have shown. my improved broke in three of its operative posh Like-characters of reference designate eorresponding ports in all of the figures.

10 designates a base or other fixed: portion 11 is a brake-sheave ailixed to a. rotary shacfit, In elevators. this broke sheave is usually a part of a coupling between the motor shaft and the shaft of the rest. of the hoisting apparatus.

12, 12 are brake-shoes held in arms 13, 13, the lower ends of which are pivotally conneoted to the base 10. The upper ends of these pivoted arms are connected by links 14, the lengths of which are adjustable, with opposite ends of the lever 15. This lever is centrally pivoted at 16 to a stationary bracket which is afiixed to some part of the elevator or other machine.

17 is an actuating lever rigidly nilixed to or an integral part of the lever 15. This actuating lever may be moved up and down to release and apply the brake-shocs to the rotary shea ve 11 by any suitable means. For cxamplt, an eyebolt 18, and may be adjustably ailixed to the plunger or core o't' a solenoid magnet '19, which, when energized. will raise the plunger and the lever 17 to release the brake, and when'deiinergized, will allow the plunger to drop to lower the lever and tojapply the broke.

The parts thus .far described are in eomtomury to provide u weight or spring to pull down upon the lever 17. When this is done it has been found desirable to provide some moons of" causing the action of such spring orweigllt to take effect gradually. Ordinuri-ly, o (lush-pot results in delaying the first opplication of tho .hrakeshoe.

lit in one ol. the objects ofi this invention to retiriu the mlvantuges oi such construe tione without their attendant disedvuntagcs.

20 designates u verticelly movable hair which posses through an opening near the end; of the actimting lever 11'. In the upper end of this her is u slot 91;.

2% is a. pin which passes throtnrh thedever 17 and freely through this clot. [the her, thhreiiore; has :1 lost-motion: connection with. the ttflhlllttlnfl lever. (in the her are :t plure lityoi" woighteflil, more or less 0% which may he used to suit the requirements of any particular ruse. The lower end oi. the her is connected to the piston 9st of an air dnollpot, curl this is mounted: upon the hose 1d. d

96 is n valve which opens during then word inz'ivoniunt of the piston so that its rnoveu'iont in this direction is not retarded, and 27. is an adjustable uir outlet by menus of which the rute of the downwurtl movcrncnt of the piston may he rcgnilutwl.

F18 u. cover for the weights and the upper part of the cylinder 25 of the duslrpot. It tension sg'n'inp; 30 is ccmncctcd hctwoen the actuating lever 17 und a lug: E29 projecting); from the side of the bur 20. This connection may be made by fastening; one end ofthe spring to a plute 31 on the pin and its other end to a threaded rod which passes through the log and provided with on ad justing nut 33, by means or which the tension on the spring, may be varied.

I will now point out the operation of the device. When the actuating lever 17 is raised to move th brake-shoes away from tho bmko sheaves 11, the pin 52d, engaging the upper end of the slot. 253, bar 20, the weights 23, and the piston 24, which are connected therewith. At the same time the tension on the spring 30 will be increased. The parts are shown in these relative positions in Fig. 2. Now, when it fill will raise the n'hOQS, the weight? the rad 93."; z,

is QGSRQCE is mg i. allowed r liOWIflWiUGlKj/ upon dia-teiy puai the actuatin n and will cause the brake-wees m be applia (to the. brake sheave. The Weight 0f the 1001i; 18 and the aris which are conneatedwith it assist in. this part of *fJh-e operaiiun, mud. the slot 21 is of's'ufficiem Liengthto 231cm the pin 22 to name freely dowm mrp in fact this pin 1183 63 strikeisihe Sewer earl of the slot. lnlfigg, 3 11 brake-shoes shown applied 811(1 the aris in the rlartiv s positions just des cribed. As soon as the ad mating lever thus dmps :0 apply the Ma.

0 nwve fiewnward, but the-i? 11 smznmi; will be reiard'cz by the actien of the; dash pot. As they mow Lima 1 11% mp 0f slot engages with the pin 2) is Show in Fig. i, so that the weights 1}. graduaiqy force the actuating level 1? farther e'w'n who apply a, powerful braking effecfi to the brake sheave. It may be seam that by this arrangel'nent the 'advantaga 0 .9 flow-mam ing heavy weight 1113011 the animatinghave? is retained Wit-E1011!) *i' lapse of time in apply" bmke-shoes are instaia mppiieti and to exercise their-376mm afieci; seen til-e operate]: the. zralzing 0 0 11,

we brakea s0 that the roiming n mber A54 slaw and thismetabdirg efieci; is than 53011 up by the more powfirffui agency ei weighted bar'fiBO.

W113i 1 claimisn L A 'braka, an cimtimg lave filer afar, means lor moving the lea er to release we pat, d.

m'vixgg a 3 1% mm. pesziiwla 6 M13, Wm. saw wulght. 3. A brake, an acmating iever fixemfmr, means far mkwlng the lever in; feliease 115: brake, combiuefl with a bar comwcted to smi aw y by a Eosbmotien ctmnecti-an, 2), waighi; connect/d in said 1021 :1 spring wmiecting smaciuming lever and @118 bar, and. a 02 130; rieft awdfng flag mevement of the flirec'iiu" L .li g vex tmamfor, war in raiezme the suzifi. Saver. :1 w 1th said bar ough which 0 fiar fetmcding I a 515171115; c lavey and the bar.

41- A brake, 2m, actuating have): therefor, means for m0 ting the, lever 10 release the brake; a pin pmjescing from said lawn, a weight 0, 4 warmest-ed therewith,'said bar (mated with slat-tifzreugh whisk vim pmjsacts a dash-pat for reim'ding' the movmnent of the Weight in 011% fleetm, n'zeans for reg u mzing iihe amt-ion an? L E an mfi'usiabie i'ensiim spring t'w n i3 1 pin and bar. Ha ha ,HHOQEJ 'whaareof I have siname in this specifimtienin b: a iiwa aubscribiilg Witnesses.

FREDIHE H(31E5 EL Ti?" Winesses Axamam E. Prawn?? HENEY Timi am, J1;

the actuating a ramming A in we direc- 

